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Investor Presentaiton

r Gross Margin (1) A Diversified Electric and Gas Utility Rate Base by Service Territory Natural Gas 21% 3,000 ($Millions) 2,773 Total Rate Base Electric 2,500 79% 2,334 4,500 4,031 4,000 3,412 Authorized Rate Base 3,500 Customers Commercial 16% 2,000 Industrial & Other 1% 1,500 Estimated Rate Base $ Millions 3,000 2,500 2,000 1,500 Residential 83% 1,000 1,000 500 627 557 516 500 430 Gross Margin (1) 90 115 South Nebraska Dakota 1% 15% Montana Electric Montana Natural Gas South Dakota Electric So. Dakota/ Nebraska Natural Gas Montana 84% Data as reported in our 2020 10-K NorthWestern's '80/20' rules: Approximately 80% Electric, 80% Residential and 80% Montana. Over $4.0 billion of rate base investment to serve our customers (1) Gross Margin, defined as revenues less cost of sales, is a non-GAAP Measure. See appendix for additional disclosure. 6
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